Benjamina?

[penrosie]

have we considered

[name_f]Minerva[/name_f]

[name_f]Wilhelmina[/name_f]

[name_f]Vilma[/name_f]

[name_f]Wilma[/name_f]

[name_f]Velma[/name_f]

I think those would be more usable for that nickname